[Hallicrafters] SX-62

[Barry Hauser]

Radio Shack sells a small line transformer that's intended for 70v PA
systems, but is regularly used by many of us as an impedance matching
transformer.  It's Catalog Number 32-1031 and sells for $6.99.  The
primary has 5 and 10 watt taps -- use the 10 watt to the 500 ohm output
of the SX-62.  Secondary taps are 4, 8 and 16 ohms.  Use the 4 ohm tap
for your R48 speaker.  These are sold in the RS stores, but may be found
closer to the speakers than the rest of the transformers.  They're on a
blister pack.

I've used these with a variety of 500 and 600 ohm radios with good
results.  Some might say use a better quality unit, especially
considering the push-pull 6V6 pair.  AES (Antique Electronic Supply)
sells a 600 ohm Hammond transformer for about $20.  I haven't tried those
and some say there is no discernable difference.  

Don't hook that 3.8 ohm speaker across the 500 ohm output.  Also, check
to make sure that a previous owner didn't swap out the 600 ohm
transformer for a low impedance one -- or install another matching
transformer between the output transformer and the 500 ohm output
terminals.  I've seen both situations and then some.  

Hope this helps.

Barry


On Tue, 07 Jan 2003 20:40:05 -0600 Scott Millick <smillick at wamusa.com>
writes:
> I have a SX-62 that is not working  One thing I noticed is that in 
> the back there is a 500 or 5000 ohm output for the speaker. I cant
remember 
> what we did then as the R48 is 3.8 ohms. Anyway would like one that
works as 
> it helped me get into ham radio in 1958 and my grandad had one like it.

> ANy ideas on someone who works on them or someone who has a working 
> one?

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